I have both extended data set format and extended addressability (which is 
different) set in out default data class.  There is no problem with extended 
addressability that I know of, which is what the OP was asking about, but there 
are several issues with extended data set format, as you said: temporary data 
sets, ISPF backup utility data sets, CA-Datacom data sets, CA-PDSMAN database, 
ADRDSSU backup data sets (which I believe has been fixed in z/OS 1.13), SAS 
data sets.

On Wed, 16 Apr 2014 09:37:38 -0400, Nathan J Pfister <[email protected]> 
wrote:

>John et al;
>
>You say that EVERY DATACLAS you have is set to Extended Addressing?  Man,
>we must have screwed something up when we tried that.  On our sandbox, we
>created all of our DATACLAS to have Extended Addressing, and quite a few
>different things broke.  Temporary datasets, Recovery datasets, certain
>software datasets...Did none of that break for you?  Does any one else
>have experience changing over to Extended Addressing?  Are there other
>things that definitely will NOT work with Extended Addressing?
>
>Thanks;
>
>Nathan Pfister
>zOS Systems Programmer
>AES\PHEAA - Tech Services
>[email protected]
>(717) 720-2663
>
>
>
>From:   "John McKown" <[email protected]>
>To:     [email protected]
>Date:   04/16/2014 09:00 AM
>Subject:        Re: ZFS - Allocation Failure
>Sent by:        "IBM Mainframe Discussion List" <[email protected]>
>
>
>
>Yes, you can alter an existing DATACLAS to have the Extended Addressing
>attribute. HOWEVER! This does not affect _any_ existing data sets. It only
>affect _NEW_ allocations. Every DATACLAS we have in our house has Extended
>Addressing set. We have not noticed any impact from doing this. We did
>this
>because we had programmers use the non-Extended DATACLAS for VSAM data
>sets, then get upset 8 months later when their "small" data set had to
>exceed 4Gig. When told to unload/delete/define/reload, they got quite
>incensed
>
>
>On Wed, Apr 16, 2014 at 7:53 AM, Christian D
><[email protected]>wrote:
>
>> Thank you sir. Is it possible to alter the existing Data clas to address
>> the extended format ? Will there be any impact to the existing Datasets
>?
>>
>>
>> On Wed, Apr 16, 2014 at 6:14 PM, Staller, Allan <[email protected]
>> >wrote:
>>
>> > *NO*
>> >
>> >
>> > <snip>
>> > I was getting the below error while allocating ZFS, I understand that
>> VSAM
>> > has a limit of 4GB and the below allocation is more than 4GB. We have
>not
>> > defined a DATACLAS to honour allocation more than 4GB. Is there a
>other
>> way
>> > to allocate >4G of VSAM without having a dataclas ?
>> >
>> > IDCAMS  SYSTEM SERVICES TIME:
>> > 3        04/16/14     PAGE
>> > 1
>> >
>> >
>> >  DEFINE CL
>> > -
>> >  (NAME(CHRIS.DB2.LOG) LIN SHR(3,3) -
>> >  CYL(8000 1000)
>> > -
>> >  STORCLAS(SCSTOR)
>> > -
>> >  )
>> >
>> > IGD01010I ALLOCATION SET TO SGSTOR STORAGE GROUP IGD17103I CATALOG
>ERROR
>> > WHILE DEFINING VSAM DATA SET CHRIS.DB2.LOG RETURN CODE IS 140 REASON
>CODE
>> > IS 110 IGG0CLEV IGD306I UNEXPECTED ERROR DURING IGG0CLEV PROCESSING
>> RETURN
>> > CODE 140 REASON CODE
>> > 110
>> > THE MODULE THAT DETECTED THE ERROR IS
>> > IGDVTSCU
>> > SMS MODULE TRACE BACK - VTSCU VTSCT VTSCH VTSCG VTSCD VTSCC VTSCR
>SSIRT
>> > SYMPTOM RECORD CREATED, PROBLEM ID IS
>> > IGD00475
>> > IGD17219I UNABLE TO CONTINUE DEFINE OF DATA SET CHRIS.DB2.LOG IDC3014I
>> > CATALOG ERROR IDC3009I ** VSAM CATALOG RETURN CODE IS 140 - REASON
>CODE
>> IS
>> > IDC3009I
>> > IGG0CLEV-110
>> > IDC3003I FUNCTION TERMINATED. CONDITION CODE IS
>> > 12
>> >
>> >
>> > IDC0002I IDCAMS PROCESSING COMPLETE. MAXIMUM CONDITION CODE WAS
>> > 12
>> > </snip>
>> >
>> > ----------------------------------------------------------------------
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>
>
>
>--
>There is nothing more pleasant than traveling and meeting new people!
>Genghis Khan
>
>Maranatha! <><
>John McKown
>
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